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diff --git a/cpp/src/polo/pairing/message/secretackmessage.h b/cpp/src/polo/pairing/message/secretackmessage.h
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+++ b/cpp/src/polo/pairing/message/secretackmessage.h
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+// Copyright 2012 Google Inc. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef POLO_PAIRING_MESSAGE_SECRETACKMESSAGE_H_
+#define POLO_PAIRING_MESSAGE_SECRETACKMESSAGE_H_
+
+#include <stdint.h>
+#include <string>
+#include <vector>
+#include "polo/pairing/message/polomessage.h"
+
+namespace polo {
+namespace pairing {
+namespace message {
+
+// Ack for a secret message.
+class SecretAckMessage : public PoloMessage {
+ public:
+  // Creates a new ack for the given secret.
+  // @param secret the secret
+  explicit SecretAckMessage(const std::vector<uint8_t>& secret);
+
+  // Gets the secret.
+  const std::vector<uint8_t>& secret() const;
+
+  // @override
+  virtual std::string ToString() const;
+ private:
+  std::vector<uint8_t> secret_;
+
+  DISALLOW_COPY_AND_ASSIGN(SecretAckMessage);
+};
+
+}  // namespace message
+}  // namespace pairing
+}  // namespace polo
+
+#endif  // POLO_PAIRING_MESSAGE_SECRETACKMESSAGE_H_